Thiazole containing coumarin compounds

ABSTRACT

Compounds of the general formula I ##STR1## where B 2  and B 2  independently of one another are hydrogen, C 1  -C 6  -alkyl which may or may not be interrupted by oxygen or sulfur and is unsubstituted by hydroxyl, C 1  -C 4  -alkoxy, C 1  -C 4  -alkylmercapto, cyano, phenylmercapto (which is unsubstituted by chorine or methyl), unsubstituted or substituted carbamoyl or a carboxylic acid ester group, benzyl or phenylethyl which are unsubstituted or substituted in the ring by chlorine, bromine, methyl, ethyl, methoxy or ethoxy, phenyl which is unsubstituted or substituted by chlorine, bromine, hydroxyl, methoxy, ethoxy, methyl, C 1  -C 4  -alkylmercapto, C 1  -C 4  -alkanoylamino or amino, unsubstituted or substituted carbamoyl or a carboxylic acid ester group, 
     B 2  may in addition be cyano, C 2  -C 4  -alkanoyl, benzoyl which is unsubstituted or substituted by chlorine, methyl, methoxy or ethoxy, C 1  -C 6  -alkylsulfonyl, or phenylsulfonyl, which is unsubstituted or substituted by chlorine, bromine, methyl, methoxy, ethoxy, amino, C 1  -C 4  -alkanoylamino, C 1  -C 4  -alkylsulfonyl or benzoylamino, 
     B 1  and B 2  together may also be a saturated 5-membered or 6-membered ring which may or may not contain oxygen or sulfur, 
     X is oxygen or imino and 
     the ring A may be substituted. 
     Such compounds are outstandingly suitable for dyeing synthetic fibers and plastics.

This is a continuation of application Ser. No. 011,995, filed Feb. 14, 1979.

The present invention provides novel compounds of the general formula I ##STR2## where

B¹ and B² independently of one another are hydrogen, C₁ -C₆ -alkyl which may or may not be interrupted by oxygen or sulfur and is unsubstituted or substituted by hydroxyl, C₁ -C₄ -alkoxy, C₁ -C₄ -alkylmercapto, cyano, phenylmercapto (which is unsubstituted or substituted by chlorine or methyl), unsubstituted or substituted carbamoyl or a carboxylic acid ester group, benzyl or phenylethyl which are unsubstituted or substituted in the ring by chlorine, bromine, methyl, ethyl, methoxy or ethoxy, phenyl which is unsubstituted or substituted by chlorine, bromine, hydroxyl, methoxy, ethoxy, methyl, C₁ -C₄ -alkylmercapto, C₁ -C₄ -alkanoylamino or amino, unsubstituted or substituted carbamoyl or a carboxylic acid ester group,

B² may in addition be cyano, C₂ -C₄ -alkanoyl, benzoyl which is unsubstituted or substituted by chlorine, methyl, methoxy or ethoxy, C₁ -C₆ -alkylsulfonyl, or phenylsulfonyl which is unsubstituted or substituted by chlorine, bromine, methyl, methoxy, ethoxy, amino, C₁ -C₄ -alkanoylamino, C₁ -C₄ -alkylsulfonyl or benzoylamino,

B¹ and B² together with the carbon atoms to which they are attached may also form a 5-membered or 6-membered ring fused to the thiazole ring and optionally containing oxygen or sulfur but free from further unsaturation,

X is oxygen or imino and

the ring A may be substituted.

In a preferred embodiment, the invention provides novel compounds of the general formula I a ##STR3## where

R¹ is hydrogen, C₁ -C₄ -alkyl, benzyl, phenylethyl, phenyl, hydroxyl, C₁ -C₄ -alkoxy, acyloxy, fluorine, chlorine, bromine, amino or substituted amino,

R² is hydrogen, C₁ -C₄ -alkyl, hydroxy, C₁ -C₄ -alkoxy, acyloxy, chlorine or bromine,

R¹ and R² together with the carbon atoms to which they are attached may also form a fused benzo ring,

R³ is hydrogen, C₁ -C₄ -alkyl or chlorine, and

B¹, B² and X have the meanings stated above.

Specific examples of radicals B¹ and B², in addition to those already mentioned, are: CH₃, C₂ H₅, C₃ H₇, C₄ H₉, C₅ H₁₁, C₆ H₁₃, CH₂ OH, CH₂ OCH₃, CH₂ OC₂ H₅, C₂ H₄ OH, C₂ H₄ OCH₃, C₂ H₄ OC₂ H₅, C₂ H₄ OC₄ H₉, C₂ H₄ OC₂ H₄ OH, C₂ H₄ OC₂ H₄ OCH₃, C₂ H₄ OC₂ H₄ OC₄ H₉, ##STR4## C₂ H₄ SCH₃, C₂ H₄ SC₂ H₅, CH₂ SC₆ H₅, C₂ H₄ SC₆ H₅, C₂ H₄ SC₆ H₄ Cl, C₂ H₄ CN, CH₂ CN, CH₂ CONH₂, CH₂ CONHCH₃, CH₂ CON(CH₃)₂, C₂ H₄ CONH₂, CH₂ COOCH₃, CH₂ COOC₂ H₅, CH₂ COOC₄ H₉, C₂ H₄ COOCH₃, C₂ H₄ COOC₄ H₉, CONH₂, CONHCH₃, CONHC₂ H₅, CONHC₄ H₉, ##STR5## CON(CH₃)₂, CON(C₂ H₅)₂, CONHC₂ H₄ OCH₃, CONHC₂ H₄ OC₂ H₅, CONH(CH₂)₃ OC₂ H₄ OC₆ H₅, CONHC(CH₂)₃ OCH₂ C₆ H₅, CON(C₂ H₄ OCH₃)₂, CON(C₂ H₄ OC₂ H₅)₂, COOCH₃, COOC₂ H₅, COOC₃ H₇, COOC₄ H₉, COOC₅ H₁₁, COOC₆ H₁₃, COOC₈ H₁₇, COOCH₂ --CH═CH₂, COOC₂ H₄ OCH₃, COOC₂ H₄ OC₂ H₅, COOC₂ H₄ OC₄ H₉, COOC₂ H₄ OC₂ H₄ OCH₃, COOC₂ H₄ OC₂ H₄ OC₄ H₉, COOCH₂ CH₂ CH₂ OCH₃, COOCH₂ CH₂ CH₂ OC₃ H₇, CO(CH₂)₃ OC₂ H₄ OC₆ H₅, COO(CH₂)₃ OCH₂ C₆ H₅, COOC₂ H₄ SC₂ H₅ and COOC₂ H₄ SC₆ H₅.

The radicals with more than two carbon atoms, such as C₃ H₇ or C₄ H₉, include the n- and i-structures and, where relevant, the t-structures.

Examples of alkyl and alkoxy radicals B¹, B² and R¹ to R³ are butyl, propyl, ethyl, butoxy, propoxy and especially methyl, methoxy and ethoxy.

Acyloxy radicals R¹ and R² are, in particular, C₁ -C₈ -alkanoyloxy, eg. acetoxy, propionyloxy, butyryloxy, hexanoyloxy, octanoyloxy and β-ethylhexanoyloxy, or benzoyloxy.

The substituted amino radicals R¹ generally have the formula ##STR6## where

Z¹ and Z² independently of one another are hydrogen or unsubstituted or substituted alkyl, cycloalkyl, aralkyl or aryl or

Z¹ and Z² together with the nitrogen form a heterocyclic ring.

Preferred substituted amino radicals have the formula ##STR7## where

Z³ is hydrogen, C₁ -C₄ -alkyl which is unsubstituted or substituted by hydroxyl, cyano, C₁ -C₄ -alkoxy, chlorine, bromine, carboxyl, carbo-C₁ -C₄ -alkoxy, carboxamide or acetoxy, cyclohexyl, benzyl, phenylethyl, phenyl or p-tolyl,

Z⁴ is hydrogen or C₁ -C₄ -alkyl which is unsubstituted or substituted by cyano, C₁ -C₄ -alkoxy, chlorine, bromine, carboxyl, carbo-C₁ -C₄ -alkoxy, carboxamide or acetoxy and

Z³ and Z⁴ together with the nitrogen may also form a 5-membered or 6-membered saturated, heterocyclic ring.

In addition to the radicals already mentioned specifically, the following may be mentioned at substituents:

Z³ and Z⁴ : methyl, ethyl, n- and i-propyl, n- and i-butyl, β-methoxyethyl, β-ethoxyethyl, β-acetoxyethyl, β-chloroethyl, β-carbomethoxyethyl, β-carboethoxyethyl, β-carbobutoxyethyl, β-methoxypropyl, β-ethoxypropyl, β-methoxy-γ-chloropropyl and β-acetoxypropyl.

Together with the nitrogen, Z³ and Z⁴ are, for example, a pyrrolidine, piperidine, morpholine, piperazine or N-methylpiperazine radical.

A compound of the general formula I may be prepared by reacting a compound of the general formula II ##STR8## with a compound of the general formula III ##STR9## where Y is cyano, C₁ -C₄ -alkoxycarbonyl or carbamoyl, of which cyano and carbamyl are preferred, and B¹, B² and A have the meanings given above.

It is also possible to react a compound of the general formula IV ##STR10## with a compound of the general formula ##STR11## where Hal is chlorine or bromine and B¹, B² and A have the meanings given above.

The preparation of compounds of the general formula IV is known, for example, from East German Pat. No. 109,017.

A compound of the formula IV is also obtained if a compound of the formula V ##STR12## where A and X have the above meanings, is reacted with H₂ S in an organic solvent in the presence of a basic catalyst, eg. triethylamine, at from 50° to 120° C. Examples of organic solvents which may be used are alcohols, glycols, glycol ethers, hydrocarbons, pyridine or amides.

The compounds of the general formula III may be prepared by methods similar to that described by Hantzsch (Ann. 250, 257).

The reactions to give the compounds of the general formula I may be carried out similarly to conventional methods; advantageously, the reaction is carried out in an organic solvent, such as an alcohol, glycol, glycol ether, hydrocarbon, halohydrocarbon, amide, ether or ketone, or in dimethylsulfoxide, with or without the presence of water.

Examples of preferred solvents are methanol, ethanol, n- and i-propanol, n- and i-butanol, glycol monomethyl ether, glycol monoethyl ether and toluene.

The reaction is preferably carried out in the presence of an acid or basic catalyst. Examples of suitable catalysts are acetic acid, tertiary amines, eg. triethylamine, or piperidine or pyrrolidine.

Details of how the reaction may be carried out are to be found in the Examples, where parts and percentages are by weight, unless stated otherwise.

Compounds of particular importance are those of the formula I b ##STR13## where

B³ and B⁴ independently of one another are hydrogen, C₁ -C₄ -alkyl, phenyl which is unsubstituted or substituted by chlorine, methyl or methoxy, N-mono-substituted or N,N-di-substituted carbamyl of 1 to 11 carbon atoms in the substituents, or a carboxylic acid ester group of 1 to 11 carbon atoms in the alcohol radical,

B⁴ may also be cyano, acetyl, propionyl, benzoyl, methylsulfonyl, ethylsulfonyl, phenylsulfonyl, chlorophenylsulfonyl or tolylsulfonyl,

R⁴ is hydroxyl, C₁ -C₄ -alkoxy, C₁ -C₈ -alkanoyloxy, benzoyloxy or ##STR14##

and X, Z³ and Z⁴ have the meanings given above.

Z³ and Z⁴ are preferably independently of one another methyl, ethyl or propyl or, together with the nitrogen, form a saturated heterocyclic ring, eg. pyrrolidine, morpholine or piperazine.

R⁴ is preferably ##STR15##

The compounds of the formula I fluoresce and are in the majority of cases suitable for use as dyes, especially for dyeing polyesters. They give brilliant dyeings, having, in some cases, very good fastness characteristics, amongst which the fastness to thermofixing, and the wetfastness, deserve particular mention.

Some of the new dyes can also be applied by the process described in German Pat. No. 1,811,796.

Further, some of the dyes may be used for transfer printing and as solvent dyes.

Some of the new products are suitable for use as optical brighteners.

The compounds of the formula I can also be considered for use as laser dyes.

Production of precursors EXAMPLE A

17.7 parts of thiocarbamoyl-acetamide, in 60 parts by volume of isopropanol, are stirred with 29.9 parts of ω-bromo-acetophenone for 2 hours at 50° C. After this time, the reaction mixture is stirred into ice water and rendered neutral with 2 N NaOH, and the product is filtered off. 28 parts (85.6% of theory) of [4-phenyl-thiazolyl-2-]-acetamide, of melting point 190°-192° C., are obtained.

The thiazoles of the formula III shown in Table 1 are obtained if the corresponding starting materials are employed and in other respects the procedure described in Example A is followed.

                                      TABLE 1                                      __________________________________________________________________________      ##STR16##                             (III)                                   Example                                                                             Y      B.sub.1  B.sub.2       Melting point                               __________________________________________________________________________           ##STR17##                                                                            CH.sub.3                                                                                 ##STR18##    148-150                                     C                                                                                    ##STR19##                                                                            CH.sub.3 C.sub.6 H.sub.5                                                                              136-139                                     D                                                                                    ##STR20##                                                                            CH.sub.3 C.sub.6 H.sub.5                                                                              liquid                                      E                                                                                    ##STR21##                                                                            CH.sub.3                                                                                 ##STR22##    188-190                                     F    "      "                                                                                        ##STR23##    160-162                                     G    "      "                                                                                        ##STR24##    95-97                                       H    "      "                                                                                        ##STR25##     98-100                                     I    "      "                                                                                        ##STR26##    76-79                                       K                                                                                    ##STR27##                                                                            "                                                                                        ##STR28##    55-59                                       L    "      "                                                                                        ##STR29##    48-50                                       M    CN     "        C.sub.6 H.sub.5                                           N                                                                                    ##STR30##                                                                            CH.sub.3 C.sub.6 H.sub.5                                                                              136-139                                     O    "      C.sub.6 H.sub.5                                                                         H             190-192                                     P    "                                                                                      ##STR31##                                                                              H             30°                                  Q    "      CH.sub.2 Cl                                                                             H             78-80                                       R    "      C.sub.6 H.sub.5                                                                         CH.sub.3      70-75                                       S    "      CH.sub.3                                                                                 ##STR32##    108-109                                     T    "      CH.sub.3                                                                                 ##STR33##    192-195                                     __________________________________________________________________________

Production of compounds according to the invention EXAMPLE 1

8.3 parts of 7-diethylamino-3-thiocarbamoylcoumarin and 7 parts of ω-bromo-acetophenone in 30 parts by volume of isopropyl alcohol are boiled with 3 parts of triethylamine for 1 hour. The precipitate is filtered off and washed with isopropyl alcohol and water. 9.1 parts (80.6% of theory) of 7-diethylamino-3-(4-phenylthiazol-2-yl)-coumarin of melting point 127°-130° C. are obtained.

7-Diethylamino-3-thiocarbamoylcoumarin, used as the starting compound, may be prepared as described in East German Pat. No. 109,017.

The thiazolylcoumarins listed in Table 2 were synthesized similarly.

                                      TABLE 2                                      __________________________________________________________________________      ##STR34##                                                                      Example                                                                             ##STR35##    B.sub.1                                                                            B.sub.2     pointMelting                                __________________________________________________________________________           ##STR36##   CH.sub.3                                                                            ##STR37##  178-180                                      3    "            "                                                                                   ##STR38##  223-225                                      4    "            "                                                                                   ##STR39##  238-240                                      5    "            "                                                                                   ##STR40##  179-182                                      6    "            "   C.sub.6 H.sub.5                                                                            181-190                                      7                                                                                    ##STR41##   "   "           230-235                                      8                                                                                    ##STR42##   "   "           189-191                                      9    "            C.sub.6 H.sub.5                                                                    CH.sub.3    220-222                                      10                                                                                   ##STR43##   CH.sub.3                                                                           C.sub.6 H.sub.5                                                                            194-196                                      11                                                                                   ##STR44##                                                                                   ##STR45##      217-225                                      12                                                                                   ##STR46##   CH.sub.3                                                                           C.sub.6 H.sub.5                                                                            260-266                                      13                                                                                   ##STR47##   "   "           168-174                                      __________________________________________________________________________

EXAMPLE 14

3.9 parts of 4-diethylaminosalicylaldehyde and 4.3 parts of the compound from Example F in 40 parts by volume of n-butanol are refluxed with 0.5 part by volume of pyrrolidine for 1 hour. The precipitate formed is filtered off and washed with n-butanol and water. 6.5 parts (87.4% of theory) of 7-diethylamino-3-(4-methyl-5-carbomethoxy-thiazol-2-yl)-coumarin, of melting point 252°-253° C., are obtained.

The coumarins listed in Table 3 were synthesized similarly.

                                      TABLE 3                                      __________________________________________________________________________      ##STR48##                                                                      Example                                                                             ##STR49##    B.sub.1                                                                           B.sub.2      pointMelting                                __________________________________________________________________________     15                                                                                   ##STR50##   CH.sub.3                                                                          CONHC.sub.6 H.sub.5                                                                         235-37                                       16   "            "                                                                                  ##STR51##   245-248                                      17                                                                                   ##STR52##   "  C.sub.6 H.sub.5                                                                             235-239                                      18                                                                                   ##STR53##   "  "            195-97                                       19                                                                                   ##STR54##   CH.sub.3                                                                          "            189-191                                      20                                                                                   ##STR55##   C.sub.6 H.sub.5                                                                   H            130-133                                      21                                                                                   ##STR56##   "  H            189-191                                      22                                                                                   ##STR57##   CH.sub.3                                                                          CO.sub.2 CH.sub.3                                                                           252-253                                      23   "            "  CO.sub.2 C.sub.2 H.sub.5                                                                    216-217                                      24   "            "                                                                                  ##STR58##   185-188                                      25   "            "                                                                                  ##STR59##   207-210                                      26   "            "  CO.sub.2 C.sub.2 H.sub.4OC.sub.4 H.sub.9                                                    165-167                                      27   "            "  CO.sub.2 C.sub.2 H.sub.4OC.sub.4 H.sub.9                                                    118-120                                      28                                                                                   ##STR60##   "  CO.sub.2 C.sub.2 H.sub.4OC.sub.4 H.sub.9                                                    133-134                                      29                                                                                   ##STR61##   "  "            132-133                                      30                                                                                   ##STR62##   "  CO.sub.2 C.sub.2 H.sub.5                                                                    262-263                                      31                                                                                   ##STR63##   "  C.sub.6 H.sub.5                                                                             195-197                                      32                                                                                   ##STR64##   "  "            228-232                                      33   "            C.sub.6 H.sub.5                                                                   CH.sub.3     223-225                                      34                                                                                   ##STR65##   "  "            241-242                                      35                                                                                   ##STR66##   "  "            185-189                                      36   "            CH.sub.3                                                                          COCH.sub.3   226-228                                      37                                                                                   ##STR67##   "  "            233-235                                      38                                                                                   ##STR68##   CH.sub.3                                                                          COC.sub.6 H.sub.5                                                                           159-164                                      39                                                                                   ##STR69##   "  "            240-243                                      40   "            "  CO.sub.2C.sub.4 H.sub.9                                                                     253-256                                      __________________________________________________________________________

EXAMPLE 41

3.9 parts of 4-diethylaminosalicylaldehyde and 4 parts of 2-cyanomethyl-4-phenyl-thiazole in 40 parts by volume of isopropyl alcohol are refluxed with 0.5 part by volume of pyrrolidine for 1 hour. The reaction mixture is then cooled and the precipitate is filtered off and washed. 6.1 parts (81.3% of theory) of 7-diethylamino-3-(4-phenylthiazol-2-yl)-iminocoumarin, of melting point120°-128° C., are obtained. 

We claim:
 1. A compound of the formula: ##STR70## wherein B¹ and B² independently of one another are hydrogen; C₁ -C₆ alkyl; C₁ -C₆ alkoxy optionally interrupted by oxygen or sulfur; hydroxy; alkylmercapto; C₆ H₅ SCH₂ -- or C₆ H₅ SC₂ H₄ -- optionallly substituted in the phenyl ring by chloro, bromo, hydroxy or alkoxy; COOCH₃, COOC₂ H₅, COOC₃ H₇, COOC₄ H₉, COOC₅ H₁₁, COOC₆ H₁₃, COOC₈ H₁₇, COOCH₂ --CH═CH₂, COOC₂ H₄ OCH₃, COOC₂ H₄ OC₂ H₅, COOC₂ H₄ OC₄ H₉, COOC₂ H₄ OC₂ H₄ OCH₃, COOC₂ H₄ OC₂ H₄ OC₄ H₉, COOCH₂ CH₂ CH₂ OCH₃, COOCH₂ CH₂ CH₂ OC₃ H₇, COO(CH₂)₃ OC₂ H₄ OC₆ H₅, COO(CH₂)₃ OCH₂ C₆ H₅, COOC₂ H₄ SC₂ H₅ OR COOC₂ H₄ SC₆ H₅ ; carbamoyl or substituted carbamoyl;B² in addition is cyano, C₂ -C₄ alkanoyl, benzoyl, C₁ -C₄ alkylsulfonyl or phenylsulfonyl; R¹ is hydrogen, C₁ -C₄ alkyl, hydroxy, C₁ -C₄ alkoxy, C-acyloxy, chloro, bromo, amino or substituted amino; R² is hydrogen; C₁ -C₄ alkyl, hydroxy, C₁ -C₄ alkoxy or C-acyloxy; R³ is hydrogen, chloro or bromo; R¹ and R² together are --CH═CH--CH═CH-- and X is NH or O.
 2. The coumarin derivative of claim 1, which has the formula: ##STR71## 